Display screen or portion thereof with transitional graphical user interface for a tutorial



FIG. 1 is a front view of a first image of a display screen or portion thereof with transitional graphical user interface for a tutorial; and,

FIG. 2 is a front view of a second image thereof.

The appearance of the graphical user interface transitions between the images shown in FIGS. 1-2. The process or period in which one image transitions to another image forms no part of the clamed design. The dot-dash broken lines in the drawings illustrate a display screen while even broken lines illustrate portions of the graphical user interface. No subject matter shown in any of the aforementioned styles of broken lines form part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface for a tutorial, as shown and described. 